Wireless environmental sensor

Products and reference designs

Wireless environmental sensor

Block diagram

Overview

Our integrated circuits and reference designs demonstrate how to monitor various climate factors and wirelessly communicate with heating, ventilation and air conditioning (HVAC) systems and other intelligent building management systems, while significantly decreasing maintenance costs.

Design requirements

Wireless environmental sensor designs require:

  • Nano-amp quiescent current, high light-load efficient power topologies to enable 10+ years battery life.
  • Nano-power sensing and signal chain to measure temperature, humidity, ambient light and air quality.
  • Ultra-low-power wireless MCUs to enable communication with 2.4-GHz and Sub-1-GHz networks.

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Block diagram

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Temperature & humidity sensor

Point of Load (P.O.L.) Point of Load (P.O.L.) Battery-Powered Option Battery-Powered Option Energy Harvesting Option Energy Harvesting Option Button Button Motion Detector Motion Detector Comparators or ADC Comparators or ADC PIR Sensor PIR Sensor Amps Amps Non-Isolated DC/DC Power Supply Non-Isolated DC/DC Power Supply Battery Battery Boost, Buck, or LDO Boost, Buck, or LDO Load Switch Load Switch Nano Timer Nano Timer MOSFET (Reverse Polarity Protection) MOSFET (Reverse Polarity Protection) Energy Storage Energy Storage Solar Cell Solar Cell Super Cap Super Cap Backup Battery Backup Battery Energy Harvesting Energy Harvesting Load Switch Load Switch Temperature Sensor Temperature Sensor Temperature Sensor Temperature Sensor Thermistor Thermistor OR OR Humidity Sensor Humidity Sensor Amp Amp Ambient Light Sensor Ambient Light Sensor Ambient Light Sensor Ambient Light Sensor Comparator or ADC Comparator or ADC Light Dependent Resistor Light Dependent Resistor OR OR Amp Amp Signal Input/Output Protection Signal Input/Output Protection ESD Protection ESDProtection Digital Processing Digital Processing MCU or Wireless MCU (With Integrated Radio) MCUorWireless MCU(With Integrated Radio) Buffer/ Driver Buffer/Driver Voltage Translator Voltage Translator Logic Gate LogicGate Voltage Reference Voltage Reference Self-Diagnostics/Monitoring Self-Diagnostics/Monitoring Voltage Supervisor, RESET, Watchdog Timer Voltage Supervisor, RESET, Watchdog Timer Wireless Interface Wireless Interface Radio (Sub-1GHz, BLE, or ZigBee) Radio(Sub-1GHz, BLE, or ZigBee)

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